How to Set Your W-4 So You Don't Owe
Stop the April surprise — and stop over-lending the IRS. Tune your withholding for 2026.
By the Easy Guides Editorial Team · Updated for 2026
To avoid a surprise bill — or a giant refund that's really an interest-free loan to the IRS — your total withholding should roughly match your tax. The usual reasons people owe are a second income (yours or a spouse's) or side income with no withholding. Fix it with Step 2 (multiple jobs) and a flat amount in Step 4(c) (extra withholding per paycheck), then recheck mid-year.
Why people owe even after claiming “0”
The W-4 changed in 2020 — there are no more “allowances,” so “claiming 0” no longer exists the way it used to (see claim 0 or 1). The most common reason for owing is two incomes: each job withholds as if it's your only one, so together they under-withhold. Side or gig income is worse — nothing is withheld from it at all.
Why a huge refund isn't a win
A big refund feels great, but it means you had too much tax taken out all year — you lent the government your money, interest-free, and are only now getting it back. The goal isn't a big refund or a big bill; it's landing near zero.
How to dial it in
Three levers on the W-4:
- Step 2 — check the box (if two jobs with similar pay) or use the worksheet, so both incomes are withheld correctly together.
- Step 4(a) — report other income (like a side gig) so tax is withheld from your main paycheck to cover it. Or skip this and pay it as quarterly estimated tax instead.
- Step 4(c) — add a flat extra dollar amount per paycheck to close any remaining gap. Our W-4 tool helps you size it.
Check again mid-year
A raise, a new job, marriage, or a new baby all change the math. Recheck your withholding a few months in — it's much easier to correct in July than to discover a shortfall next April. See how to update mid-year.